Despacito Luis Fonsi & Daddy Yankee feat. Justin B
In the countdown to the Games, there's just a month to go before the Opening Ceremony.
To mark the date, the Olympic symbol of the Five Rings has now been positioned on to one of London's best-known landmarks, Tower Bridge.
Mayor Boris Johnson and LOCOG Chairman Lord Seb Coe were on hand to celebrate.
The Rings will be lit up overnight.